Combination door latch and bolt.



IINrrnD srAfrDis rArnNr ortica.

EDWIN C. BELKNAP AND ERsKINE II. JACKSON, lor CHICAGO, ILLINOIS.v

i COMBINATION DOOR LATCH AND BOLT.

Specification of Letters latent.

` Patented March 19, 1907.

T0 all whom, t may concern:

Be it known that we, EDWIN C. BELKNAP and ERSKINE H. JACKSON, bothcitizens of the United States, and both residing at Chicago, in thecounty of Cook and State of Illinois, have invented certain new anduseful Improvements in Combination Door Latches and Bolts, of which thefollowing is a specification.

The object of this invention is to combine the door latch and bolt insuch a manner that there will be a great saving in the space occupied bythe operating mechanism, which obviates the necessity for providing adeep or extensive cut in the door, thereby saving the labor required forinserting the lock mechanism into the door and at the same timesimplifying the locking mechanism as a whole and the individual partsthereof..

Another object of the invention is to obviate the necessity forproviding a keyhole in the door-lock, the hole being formed in the outerknob of the door in a position easy of access by authorized persons. Atthe same time the locking mechanism as a whole is so arranged that itwill be impossible to manipulate the mechanism from the outside when theparts are set to one position of adjustment, which renders the lockpeculiarly fitted for homes or other places in which absolute securityis required against the admission of burglars or other unauthorizedpersons.

The invention consists in the features of construction and combinationof parts hereinafter described and claimed.

In the drawings, Figure 1 is a perspective view showing the lockingmechanism secured to a door. Fig. 2 is a sectional elevation of a doorand door-casing, showing the locking mechanism in elevation with thelatch thrown; Fig. 3, a similar view showing the bolt thrown 5 Fig. 4,aperspective view of the socket; Fig. 5, asectional elevation showingthe interior mechanism; Fig. 6, a sectional plan view showing theinterior mechanism; Fig. 7, a cross-sectional view taken on line 7 7 ofFig. 5; Fig. 8, a similar view taken on line 8 8 of Fig. 5, and Fig. 9-a perspective view of the cam-lug for retracting the latch.

The working mechanism of the device is inclosed with a cylindricalcasing 1, consisting of a front section 2 and a rear section 3. The rearsection is provided with an end wall 4, and the sections are provided intheir forming when the two parts are assembled a hole for the passagetherethrough of the mechanism hereinafter described. Inside of the outercasing is an inner cylindricalcasing 6, which is open at its rear endand is preferably slotted back therefrom on each side to provide cuts orrecesses 7 for inserting the operative mechanism into place from therear end of the inner casing. The slots or recesses terminate inalinement with the holes formed through the sectional outer casing, andthe inner casing has secured thereto at its forward end a face-plate 8,which is embedded into lthe edge of the door and is provided with a holeor opening 9 for the projection therethrough of a bolt 10. The bolt isof cylindrical formation and of suitable diameter to slide easily withinthe inner casing and, like the inner casing, is slotted back on oppositesides to provide recesses 11, which coincide with the recesses 7 at therear end of the inner shell. I'he bolt at its forward end is providedwith a solid head 12, which when the bolt is thrust forward is adaptedto enter a socket 13, formed in a socket-plate 14, which latter isprovided with a iange 15, intended to be embedded in the door-j amb toprevent tampering with the locking mechanism.

The bolt-head has formed therein a recess 16, within which is pivoted alatch 17, which latch is normally thrust forward by means of a spring18, the latch being pivoted at its lower end by means of a crosspivot-pin 19, which allows the latch to be retracted against thepressure of the spring until the outer face of the latch issubstantially flush with the outer face or bolt. The latch is adaptedabutting edges with half-circular recesses 5,

to be retracted by means of a link 20, which is pivoted between ears 21on the inner face of the latch, which ears are substantially half-waybetween the pivotal pin 19 and the free end 22 of the latch, whichlatter is preferably curved, as shown in Il ig. 6. 2() is pivotedbetween ears 23,' Awhich form part of a yoke 24, having a cross-head 25and two pairs of side arms 26, the side arms being disconnected at theirrear ends. Each ofthe side arms has inwardly projecting therefrom a lug27, the four lugs being inthe same transverse plane, and the lugsserveas abutments for a pair of disconnected cams 28, lying within theside arms 26, as shown in Figs. 5 and 7, each of the cams being formedas The link' Ioo IIO

having at its inner end a cross cam-bar 30, the inner or acting face 31of which is in the plane of the aXial center of the hub, and the hubsextend outwardly in opposite directions between the side arms 26, andeach is provided in its end with recesses 32 for a purpose gage withelongated slots 37, cut in the cylindrical body of the bolt, so thatwhen the bolt-operating plate is turned the ears will engage with therecesses and throw the bolt forward.

Through the square hole is passed a square bolt-shank 38, which is ofsuitable size to rotate easily within the hubsA of thelatch-cams, sothat the latch-cams may be turned or moved without turning the squareshank, and, as shown, the inner ends of the camhubs are provided withbores or recesses 39, of suitable size to receive the ends of theboltplate hub, which arrangement permits the parts to act independentlyof one another, but at the same time provides a journalmounting for eachof the members and holds the parts in proper alinement.

One end of the square bolt-shank is entered into an inner knob 40,provided with a turning shank 4l, having in its end lugs 42, adapted toengage with the recesses 32 in the outer end of one of the cam-hubs, sothat by moving the knob the hub and cam member attached thereto will bemoved thereby, bringing the cam-surface 31 to bea-r against one pair oflugs 27, which when pressure is brought to bear tends to move thelatch-eperating yoke, thereby retracting the yoke 20 and the latchoperated thereby.

It will be understood that latch-cams are independently operated andthat a movement of either one of them is sufficient to move thelatch-yoke and retract the latch.

Surrounding the inner knob-shank 4l. is a sleeve or collar 43, which isrigidly secured to a door-plate 44, of the usual character, and servesas a bearing for the door-knob shank, and encircling the sleeve is abolt-operating ring 45, which is preferably milled to permit itsmanipulation, which ring is connected with the square bolt-shank bymeans of a pin 46, which passes through a circumferential slot 47 in theknob-shank and sleeve, which slot is of sufficient size to permit thesquare shank to be turned sufficiently to throw the bolt and likewise tobe retracted, for a purpose which will hereinafter appear.

The outside of the door is rovided with an outer knob 48, which containssuitable locking mechanism, which mechanism is only adapted to beoperated when a proper key is inserted into the lock mechanism. The

outer knob 4S is provided with a knob-shank 49, having ears or lugs 50,which engage the upper cam-hub in exactly the same manner that the innercam-hub is engaged., so that when the outer knob is turned the latch canbe retracted and the door opened. As shown, the knob has therein asuitable tumbler mechanism, preferably the style known as the Yale lock,which serves the purpose of illustration, which mechanism in a generalway consists of iixedly-mounted tumblers 51 and rotatably-mountedtumblers 52, the latter of which are engaged by a key .53, which movesthe tumblers into suitable position to permit the rotation of the frame54, within which the movable tumblers are located. The frame 54 has atits inner end a socket 55, into which is entered the end 5G of theboltshank, so that when the bolt-shank. is projected into the socket inthe tumbler-frame and the key is entered into the lock the bolt can beretracted by the movement of the key. The fiXedly-mounted tumbler-fra]neis rigidly secured. to an outer sleeve 57 by means of a neck 5S, which,as shown, passes through a slot 59 in the knob, which arrangementpermits the knob to be turned a sullcient distance without moving thelxcdlymounted tumblers.

In use when it desired to throw the bolt from the inside the ring 45 isthrown back toward the knob sufficiently to disengagc the end of thebolt-shank 33 from the movable tumbler-frame, after which the ringisturned, which turns the square shank and with it the bolt-plate havingthereon. the ears. This turning causes the ears to engage with the slotsin the bolt, throwing forward the bolt, without, however, moving thelatch-(n'ierating yoke, which maintains its same relative position. Thiscauses the bolt to move forward until the latch is housed, after whichthe bolting operation is complete. .lt will be noted that when the boltis thrown in this manner the bolt-shank entirely disengaged from thelocking mechanism, so that it will be impossible, even if anunauthorized person had a key, to open the door, since the turning ofthe key would not serve to actu ate the bolt mechanism at all. .ln orderto unlock the bolt from the outside, it is necessary that the bolt-shankbe moved forward sul liciently to engage with the movable tumblerframe,after which the movable frame and the bolt-shank can be turned by a keyhaving the proper configuration to move the tumblers. The arrangement asa whole is one which is very saving of space, since the entire operatingmechanism is located with the bolt itself, and. the locking mechanism ishoused entirely within the outer knob. When inserting the mechanism as awhoh` into a door, it is only necessary to drill a hole in the edge ofthe door of sul licient depth to house the mechanism, and this hole maybe llO mechanism of a diiierent style might be ernv bolt, and akey-actuated shaft in line with ployed for performing the same result.

The principal feature of the invention is the movable bolt having housedtherein the latch and the mechanism for operating the parts and,furthermore, that the parts are interchangeable and adapted to be usedupon both right and left hand doors, a feature of considerableimportance in the art to which this invention relates.

What We regard as new, anddesire to secure by Letters Patent, is-

1. In a device of the class described, the combination of a bolt, abeveled latch surrounded on all sides by and normally projectingoutwardly from the end of the bolt, mechanism located immediately behindand in line with the head end ofthe bolt for moving the latch, andmechanism for moving the bolt, substantially as described.

j `2. In a device of the class described, the combination of a bolt, alatch normally proj ecting outwardly from the end ofthe bolt, a pair ofknobs, knob-actuating mechanism located immediately behind and in linewith the head end of the bolt Jfor moving the latch, mechanismsimilarlyA located for moving the the axes of the knobs for operatingthe lastnamed mechanism, substantially as described.

3. In a device of the class described, the combination of a bolt, alatch adapted to be outwardly projected from the end of the bolt,mechanism contained within the bolt for operating the latch, a knobengaging with the latch-actuating mechanism, and means for operating thebolt, substantially as described.

4. In a device of the class described, the combination of a bolt, alatch adapted to be outwardly projected from the end of the bolt,mechanism contained within the bolt for operating the latch, a knobengaging with the latch-actuating mechanism, and means for operating thebolt independently of the latchoperating mechanism, substantially asdescribed. f

5. In a device of the class described, the combination of a bolt, alatch adapted to be outwardly projected from the end of the bolt,mechanism contained within the bolt for operating the latch, a knobengaging with the latch-actuating mechanism,^and a lock contained withinthe knob for moving the boltoperating mechanism, substantially asdescribed.

6. In a device of the class described, the combination of a bolt, alatch adapted to be outwardly projected from the bolt, means containedwithin the bolt for moving the latch, a bolt-operating mechanism, atransversely-eXtending shank upon which the boltoperating mechanism ismounted, knobs surrounding the outwardly-projectingl ends of the shank`and provided with' knob-Shanks engaged with the latch-operatingmechanism, a lock mechanism contained within one of the knobs andnormally engaged with the bolt-shank, and means independent of thelocking mechanism for turning the boltshank and disengaging thebolt-shank from the locking mechanism, substantially as described.

7. In a device of the class described, the combination of a bolt, alatch'mounted therein normally projecting outwardly from the end of thebolt, a spring for holding the latch in outwardly-projected position, amovable yoke located immediately behind the head end ofthe bolt andconnected with the latch, a pair of independently-movable cams similarlylocated, either of which is adapted to actuate the yoke, inner and outerknobs, one connected with each of the cams and adapted to actuate thesame, mechanism located immediately behind the head end of the bolt Jformoving the bolt and a key operated shaft in line with the aXes of theknobs for operating the last-named mechanism, substantially asdescribed.

8. In a device of the class described, the combination of a bolt, alatch normally roj ecting outwardly from the endof -the bo t, a springfor holding the bolt in outwardly-projected position, a movable yokeconnected with the latch, a pair oi independently-movable cams, eitherof which is adapted to actuate the yoke, inner and outer knobs, oneconnected with each of the cams and adapted to actuate the same,mechanism `contained within the bolt for moving the same, a bolt-shaftin line with the axes or'v the knobs and adapted to operate the boltmechanism and a lock within one of the knobs for actuating thebolt-shaft, substantially as described.

49. In a device ofl the class described, the combination of a bolt, alatch normally proj ecting outwardly from the endof the bolt, a springfor holding the latch in outwardlyprojected position, a movable yokeconnected with the latch, a pair of independentlymovable cams, either ofwhich is adapted to actuate the yoke, inner and outer knobs, oneconnected with each of the cams and ada ted to actuate the same',mechanism contained within the bolt for moving the same, atransversely-extendingbolt-shank upon which the bolt-actuating mechanismis mounted, a lock contained within one of the knobs and adapted to movethe shank, and means independ- IOC IIC

IIS

ent of the lock combined with the other knob for moving the shank,substantially as described.

10. In a device of the class described, the combination of a cylindricalcasing, a cylindrical bolt movable Within the casing, a beveled latchsurrounded by and normally outwardly projecting from the bolt, a springfor holding the latch in normallyT projected position, a longitudinallymovable yoke connected with the latch, a pair ot' knobs, means forimparting a longitudinal movement to the yoke by the turning of eitherof the knobs, and independent mechanism for moving the bolt,substantially as described.

11. In a device of the class described, the combination ot a bolt, alatch normally proljecting outwardly from the bolt, a spring tor holdingthe latch in normally projected position, a longitudinally-movable yokeconnected with the latch, a pair of kno bs, means for imparting alongitudinal movement to the yoke by the turning ot either of the knobs,mechanism for moving the bolt, a lock contained Within one of' the knobsfor actuating the bolt-moving mechanism, and means combined with theother knob for disengaging the bolt-actuating mechanism from the lockand for actuating the bolt mechanism, substantially as described.

12. In a device of the class described, the combination of a casingadapted to be secured Within a door, a bolt slidably mounted Within thecasing, a latch pivoted Within the end of the bolt, a spring tornormally projecting the latch outwardly, a longitudinallymovable yoke, aconnection between the yoke and the latch, lugs or abutments on theyoke, independently-movable cams bearing against the lugs or abutmentsand adapted to retract the yoke, a transversely-extending bolt-shank, abolt-actuating plate mounted upon the shank and provided with earsadapted to engage with the Wall of the bolt for moving the same, innerand outer knobs provided with Shanks engaging with the latch-actuatingcams, locking mechanism contained Within one of the knobs for turningthe bolt-shank, and means combined With the other knob for dise'ngagingthe shank from vthe locking mechanism and independently turning theshank, substantially as described.

13. In a device of the class described, the combination of a symmetricalcylindrical casing adapted to be mounted either side up Within a door, acylindrical bolt slidably mounted Within the casing, a latch movablymounted Within the end ot' the bolt, mechanism contained Within thecasing and immediately behind and in line With the head of the bolt tormoving the latch, inner and outer knobs adapted to be connected Witheither side of the casing and engage With the latchactuating mechanism,either being adapted to actuate the latch mechanism, and independentmechanism for moving the bolt, located Within the casing and immediatelybehind and in line with the head oi" the bolt, substantially asdescribed.

14. In a devite of the dass described, the combination of a symmetrhr aleasing adapted to be mounted either side up within a door, a boltslidably mounted within the easing, a latch movably mounted within theend ot the bolt, mechanism contained within. the (asing and immediatelybehind and in line with the head ot the bolt tor moving the latch, innerand outer knobs adapted to be connected with. either side ot the easingand engage with the lateh-actuating meehanism, either being adapted toaetuate the latch mechanism, a bolt-shalt extending transversely in theaxial line ot the knobs, means tor turning the shaft, and mechanismactuated by the turning ot the shaft tor moving the bolt, saidmechanism. being located within the (asing imn'iediately behind and inline with the head ot the bolt, substantially as descri bed.

15. In a mechanism ol" the class described, the combination ot a. framecomprising a symmetrieally-'forn'ied cylindrical tenon portion and atace-plate termed integrally therewith, a eylindrital bolt slidablymounted within the tenonv portion and (emprising a head having therein aretess and a hollow body portion, a latch mounted within the recessnormally projet-ting outwardly theretrom, inner and outer door-knobs,mechanism entirely Within the tenon portion of the easing and actuatedby either ot the doorknobs tor retracting the latch, and mechanism forj'nojeeting the bolt, substantially as deseribed.

16. In a mechanism of the lass described, thel combination of a tramecomprising a symmetrical tenon portion adapted to be inserted eitherside up and a face-plate secured to the tenon portion, a bolt slidablymounted. within the tenon portion and comprising a head having therein arecess and a hollow body portion, a latch mounted within the reeess andnormally projected outwardly therefrom, inner and outer door-knobs,mechanism within the body of' the bolt and aetuated by either of thedoor-knobs tor retracting the latch, a key-cylinder in one ol' theknobs, a bolt-actuating shaft in engagement with the key-cylinder, andmeans aetuated by the turning ot the shaft for moving the bolt,substantially as des( ribed.

17. In a mechanism ot the (lass desr'ribed, the eomlination of a framelcomprising a symmetrical tenon portion adapted to be inserted into adoor either side up and a faeeplate secured to the tenon portion, a boltslidably mounted within. the tenon portion and comprising a head havingtherein a recess, a latch mounted Within t-he recess and IOO normallyprojecting outwardly therefrom, inner and outer door-knobs, mechanismwithin the body of the bolt and actuated by either of the door-knobs forretracting the latch, a key-lock in one of the knobs, aboltshaftnormally in engagement with the keylock and adapted to be retractedout-of engagement therefrom, and means within the body of the boltactuated by the bolt-shaft for moving the bolt, substantially asdescribed.

18. In a device of the class described, the combination of a lock-casingof cylindrical formation terminating at its outer end in a face-plate, abolt of cylindrical formation slidably mounted within the casing, innerand outer knobs extending outwardly from the casing, a bolt-shaft, akey-lock in one of the knobs adapted to actuate the bolt-shaft, andmechanism carried by the bolt-shaft for actuating the bolt,substantially as described.

19. The combination of a cylindrical casing terminating at its forwardend in a verticallyelongated face-plate, a cylindrical bolt slidablewithin the casing, a latch normally projecting outwardly from the bolt,inner and outer knobs extending transversely of the casing, mechanismcontained within the casing and in engagement with the knobs foractuating the latch by either knob, a boltshaft in alinement with theaXes of the knobs, a key-lock in one of the knobs for turning thebolt-shaft, a bolt-actuating mechanism contained within the casing andadapted to be operated by means of the bolt-shaft, substantially asdescribed.

20. In a device of the. class described, a casing consisting of acylindrical tenori por-v tion and a face-plate, a cylindrical boltslidably mounted within the tenon portion, knobs entered through thecasing, bolt-actuating mechanism contained within the casing, and anouter protective casing of cylindrical' formation closed at its innerend and adapted to render the mechanism substantially dust-proof,substantially as described.l

EDWIN C. BELKNAP. ERSKINE H. JACKSON.

Witnesses:

WALKER BANNING, FRANCES M. FROST.

